Why don't Jews eat certain foods together?

Answer 1

The Torah specifically forbids cooking a kid (baby goat) in its mother's milk. Now, this is obviously a very specific guideline, so why don't Jews combine any dairy and meat? The reason for this expansion on the core guideline is so that no one accidentally violates it or appears to violate it. As a result, the halakha (law) doesn't permit the mixing of any dairy and meat.

Additionally, although meat and fish can be eating during the same meal, they cannot be served or eaten on the same plate. There are also some groups that do not combine dairy and fish.